Physics Practice Questions Exam 2 - Questions about Energy

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three times the usual power output

1. If you do work on an object in one-third the usual time, your power output isA) one third the usual power output.B) the usual power output.C) three times the usual power output.D) impossible to predict without additional information.

4.If an object is raised twice as high, its potential energy will beA) half as muchB) twice as much.C) four times as much.D) impossible to determine unless the time is given.

twice as much

5. An object lifted 10 meters gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain isA) half as much.B) the same.C) twice as much.D) four times as much.E) more than four times as much.

twice as much work

6.A 1000-kg car and a 2000-kg car are hoisted the same distance. Raising the more massive car requiresA) less work.B) as much work.C) twice as much work.D) four times as much work.E) more than four times as much work.

moving

7. An object that has kinetic energy must beA) moving.B) falling.C) at an elevated position.D) at rest.E) none of these

location

8. An object may have potential energy because of itsA) speed.B) acceleration.C) momentum.D) location.E) none of these

decreased

9. When bullets are fired from an airplane in the forward direction, the momentum of the airplane will beA) decreased.B) unchanged.C) increased.

half as much

10. A clerk can lift containers a vertical distance of 1 meter or can roll them up a 2 meter-long ramp to the same elevation. With the ramp, the applied force required is aboutA) half as much.B) twice as much.C) the same.D) four times as much.

40 J

11.A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy that isA) less than 40 J.B) more than 40 J.C) 40 J.D) impossible to predict without additional information

heat

12. When a car is braked to a stop, its kinetic energy is transformed toA) stopping energy.B) potential energy.C) energy of motion.D) energy of rest.E) heat.

15.After rolling halfway down an incline a marbleʹs kinetic energy isA) less than its potential energy.B) greater than its potential energy.C) the same as its potential energy.D) impossible to determine.

the top

16. The ball rolling down an incline has its maximum potential energy atA) the top.B) a quarter of the way down.C) halfway down.D) the bottom.

the bottom

17. A ball rolling down an incline has its maximum kinetic energy atA) the top.B) halfway down.C) three-quarters of the way down.D) the bottom.

the bottom

18. A block of ice sliding down an incline has its maximum speed atA) the top.B) the bottom.C) halfway down.D) difficult to predict without knowing the slope of the inclineE) difficult to predict without knowing the coefficient of friction

potential energy

19. Neglecting friction, a small ball and a similar large ball, at rest, are allowed to roll down an incline. for only one second. At this instant, the large ball will have a greaterA) potential energy.B) kinetic energy.C) speed.D) all of the aboveE) impossible to predict with the information given

none of the above choices

20. A light aluminum ball and a heavy lead ball of the same size are allowed to roll down an incline. When they are halfway down the incline, they will have identicalA) kinetic energies.B) potential energies.C) momentum.D) inertias.E) none of the above choices